File:C605-Figure-02.jpg
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Figure 2 Correlation chart showing the positions of key units within the Pennsylvanian Subsystem. Global and provincial stage boundaries and ages in millions of years (Ma) are after Gradstein et al. (2012)[1].
- ↑ Gradstein, F.M., J.G. Ogg, M.D. Schmitz, and G.M. Ogg, 2012, The geologic time scale 2012, 1st ed.: Amsterdam, Elsevier, 1,144 p.
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